#include <stdio.h>
int main(void)
{
	int arr[]={1,2,3,4,5};
	int q=sizeof(arr)/sizeof(int);
	int num=0;
	for(int i=0;i<q;i++){
		num=arr[q-1-i];
		arr[q-1-i]=arr[q-2-i];
		arr[q-2-i]=num;
	}
	for(int i=0;i<q;i++){
		printf("%d",arr[i]);
		if(i!=q-1){
			printf(",");
		}
	}
	printf("\n");
	return 0;
}
